When I have sputum induction at NJH I ask to use 10% saline after a treatment of levalbuterol( learned that hard way when they used 10% without a bronchodilator first- I had a bronchospasm) but even with 10% I produce minimal amount and it mostly saliva. But the Resp technician says it’s fine because the lab sees the smallest mucus particles under the microscope and that there is always something there. At home I produce mostly nothing that I can send to local doctor/ lab and it’s rejected.